Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

Open Question

Wiring diagram for a 3 valve s plan plus heating system

Hi .. I'm trying to wire up a heating system with 3 valves and two Horstmann wireless thermostats using a honeywell 10 way wiring centre. 
I assume that for the room stat I should wire for 230v application and for the zoned stat it should be volt free but I am uncertain as to which terminals go from the thermostats to where on the wiring system.
can anyone help

Posted by on


5 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Repairman can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Repairman (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 1420 Answers

SOURCE: installing new furnace with two zones

You will need a control to operate motorized zone dampers. In the ductwork, you will install a damper in each line going into the area you want zoned. If you have air conditioning you will also require a barometric relief damper that allows air to pass thru the ductwork and not restrict air over your A/C coil. Common controls are made by Honeywell and EWC.

If you already have the control module, you will run two or three (low voltage) wires from each motorized damper back to the control. Your thermostat wires (also low voltage) will run from each thermostat to the control module and connect to a zone relay. Match each zone by number. You will need to run power to the control module that will provide power to the thermostats as well as the motorized damper. Check on the reverse side of the control module and/or check on the web to find the wiring diagram.

Posted on Nov 21, 2008

  • 706 Answers

SOURCE: wiring honeywell digital stat

Hello davem1952,
The way you wire it will depend on how the other end of your three wires are wired into your heating system. This link
shows the various methods for wiring it and take into account the type of setup you are dealing with. You'll need to find the wiring detail ( last page) that corresponds to your setup..
Hope this helps..

Posted on Dec 13, 2008

  • 5 Answers

SOURCE: Replacing Round Honewell Mercury Thermostat

try to get one that is made for oil heat, the installation is easy only two wires, and the instructions make it easy.

Posted on Apr 26, 2009

  • 16 Answers

SOURCE: cannot get central heating working,for honeywell ST6400 programme

with y plan 3 connections on programmer HW on HW off CH on HW on to cylinder stat then HW call to Orange on Mvalve to power boiler and pump HW off to grey wire on Mvalve to close hot water CH to room stat common then heating call to white on Mvalve

Posted on Aug 17, 2009

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

How do I wire an S-Plan system with a Honeywell programmer to the Valiant ecoTEC plus 428 boiler.

hope this will help

Jan 23, 2011 | Heating & Cooling

1 Answer

I have a 2000 nissan xterra my heat dont warm up i change my thermo stat if i get my heater core flush what are my chances of it working what are the major problem with the 2000 nissan xterra i done...

forget all the above items you mentiond,the heater metrick/core should be ok if you put a cooler flush through the system,im looking at the thermo switch mounted on the top of the water system it will have two wires on it and tells the engine when to let hot water through the core,also if its not working the engine will not perform great so try this and forget about new spark plugs/wires/coil pack ,as these are nothing to do with heating.adrian,,,

Dec 31, 2010 | 2000 Nissan Xterra

1 Answer

I have a 2000 jaguar s-type, 3.0 v6. The blower motor works but there is no heat, the system has coolant and the thermostat is brand new. The coolant to the heater core is regulated by an electrically...

your climate control system is a twin system it has a duel control valve in its normal state it defaults to open both ways unless your heater matrix is blocked then if not the valve has failed or more than likely the wiring to it has corroded. on the valve electrical connector there is 3 wires the centre one is battery positive and normally goes o/c because of corroded wiring around the front bumper liner.check the centre wire using a test lamp like a 21 watt bulb to power load the supply if thats ok then you have to check the wiring back to the climate module the wiring on these cars have been a large prob around the front bumper

Oct 09, 2017 | 2000 Jaguar S-Type

1 Answer

Honeywell Wireless System THM5320R Wireless system and thermostat startup ok. The issue I am having is that; when the thermostat is in cooling mode and the unit starts the reversing valve is in the wrong...

how old is the existing system? i do ac in florida and usually if its not the wiring, an old systems rev. valve may stick. a firm tap on the valve may solve your problem.

Oct 28, 2009 | Heating & Cooling

1 Answer

Cannot get central heating working,for honeywell ST6400 programme

with y plan 3 connections on programmer HW on HW off CH on HW on to cylinder stat then HW call to Orange on Mvalve to power boiler and pump HW off to grey wire on Mvalve to close hot water CH to room stat common then heating call to white on Mvalve

Jun 13, 2009 | Honeywell Programmable Thermostat Heater

2 Answers

Wiring diagrams schematic (boilers)

call me alan 0776 7494009 have books on c, s,y plans

Mar 04, 2009 | Cooper Wiring Devices 1301-7B GROUNDING...

1 Answer

Cant find wireing diagram for carrier 585ejw30050ca

if you have a volt/ohm meter you can unplug all the wires to the valve set the meter to ohms and check to see across each terminal which have measurable resistance these should be the coil, usually the diagram is on the panel door i guess this is not the case so you will probably have to see which wires have voltage when your tstat is calling for heat also you need to make sure there are no other safety holding this circuit out let me know how you make out

Jan 09, 2009 | Carrier Heating & Cooling

3 Answers

Whats a y plan when plumbing?

s plan is upstairs and downstairs theromstats
more valves
y plan just 1 three port valve

Dec 12, 2008 | Tomtom GO 510 GPS Receiver

Not finding what you are looking for?
Heating & Cooling Logo

Related Topics:

2,887 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honeywell Heating & Cooling Experts

Bill Long

Level 3 Expert

588 Answers

Paul Carew

Level 3 Expert

2873 Answers

vance jones

Level 2 Expert

120 Answers

Are you a Honeywell Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides